"It depends." In general, they're all in-memory and dependent upon system implementation so the performance will be negligible and platform-specific for most uses. If you really care about performance, you should profile and determine your requirements. It's pretty trivial to replace any one of those methods with another.
That said, shared memory is the least intensive as there are no file operations involved (but again, very implementation-dependent). If you need to open and close (map/unmap) repeatedly, lots of times, then it could be significant overhead.
Cheers!
Sean
